Large Format Printing

Hi all.

I'm relatively new to large format printing and I got a new project for a 6m x 1m banner. I've been trying to export the design to my RIP program but I can't find a format that works with the size. Normally I use a PDF or EPS, but for this size, they just don't want to work... I read somewhere about designing in a smaller size and enlarging the design in my RIP program but I'm not really sure of the theory behind it. Any advice?